Gram-Positive Cocci Microbiology Quiz
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Questions and Answers

What is the DOC (drug of choice) for Staphylococcus aureus?

  • Cephalosporin
  • Penicillin
  • Vancomycin (correct)
  • Oxacillin

    • What is the mechanism of resistance of Staphylococcus aureus to B-lactam antibiotics?

  • Increased affinity to antibiotics
  • Activation of antibiotic efflux pumps
  • Decreased permeability of cell wall
  • Production of B-lactamase (correct)

    • What is the characteristic feature of Staphylococcus aureus on Mannitol salt agar (MSA)?

  • Shows increased susceptibility to penicillin
  • Produces green colonies
  • Can ferment mannitol (correct)
  • Forms beta-hemolysis

    • Which gene is altered in Staphylococcus aureus to confer resistance to nafcillin (methicillin, oxacillin)?

    <p>mecA &amp; mecC</p> Signup and view all the answers

    What is the drug of choice for methicillin-resistant Staphylococcus aureus (MRSA)?

    <p>Vancomycin</p> Signup and view all the answers

    What is the characteristic color of Staphylococcus aureus colonies on Mannitol salt agar (MSA)?

    <p>Golden yellow</p> Signup and view all the answers

    What is the mechanism of resistance of Staphylococcus aureus to B-lactam antibiotics?

    <p>Production of B-lactamase</p> Signup and view all the answers

    Which gene is altered in Staphylococcus aureus to confer resistance to nafcillin (methicillin, oxacillin)?

    <p>mecA &amp; mecC</p> Signup and view all the answers

    What is the drug of choice for Vancomycin-resistant Staphylococcus aureus (VRSA)?

    <p>Vancomycin</p> Signup and view all the answers

    What is the characteristic feature of Type IV CA-MRSA?

    <p>Antigenic Structure</p> Signup and view all the answers

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